<template>
	<view>

		<my-search bgcolor="pink" radius="2" @click="gotoSearch"></my-search>


		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view scroll-y="true" class="scroll-view-left" :style="{height:wh + 'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i===active?'active':''] " @click="activeChanged(i)">
						{{item.cat_name}}
					</view>
				</block>
			</scroll-view>
			<!-- 右侧滑动区域 -->
			<scroll-view scroll-y="true" :scroll-top="scrollTop" class="scroll-view-right" :style="{height:wh + 'px'}">
				<!-- 二级分类 -->
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">
						/{{item2.cat_name}}/
					</view>
					<!-- 当前二级分类下的三级分类 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>

				</view>


			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'

	export default {
		mixins: [badgeMix],
		data() {
			return {
				//页面可用区域高度
				wh: 0,
				cateList: [],
				active: 0,
				cateLevel2: [],
				scrollTop: 0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods: {
			async getCateList() {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message

				//为二级分类赋值
				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i) {
				this.active = i
				this.cateLevel2 = this.cateList[i].children
				//scrollTop赋相同值，scroll不会滚动，每次在0和1之间切换，实现每次滚动到顶部
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodsList(item) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			gotoSearch() {
				console.log('OK')
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}

		}



	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;


		.scroll-view-left {
			width: 120px;

			.left-scroll-view-item {
				background-color: #F7F7F7;
				line-height: 60px;
				text-align: center;
				font-size: 12px;
				position: relative;

				&.active {
					background-color: #FFFFFF;

					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #C00000;
						position: absolute;
						top: 50%;
						left: 0;
						transform: translateY(-50%);
					}
				}

			}
		}

		.scroll-view-right {
			background-color: #FFFFFF;
		}

		.cate-lv2-title {
			font-size: 12px;
			font-weight: bold;
			text-align: center;
			padding: 15px 0;
		}

		.cate-lv3-list {
			display: flex;
			flex-wrap: wrap;

			.cate-lv3-item {
				width: 33.33%;
				display: flex;
				flex-direction: column;
				align-items: center;
				justify-content: center;
				margin-bottom: 10px;

				image {
					width: 60px;
					height: 60px;
				}

				text {
					font-size: 12px;
				}
			}
		}
	}
</style>